DFI NB6600 Replacement Battery 10.8V 6600mAh Li-ion DR202

DFI NB6600 / NB6620 — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V 6600mAh (71.28Wh) lithium-ion battery for the DFI NB6600 and NB6620 notebook computers. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. If the original cell no longer holds charge under load, this is the direct swap.

• NB6600 and NB6620 compatibility: Both notebooks share the same 10.8V battery bay, connector pinout, and BMS handshake protocol. One cell fits both platforms without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on NB6600-class hardware. The BMS communicated correctly with the system, accepted a full charge without cutoff errors, and reported accurate state-of-charge data to the OS.
• Post-install calibration on the NB6600: After fitting this battery, run one full discharge until the laptop hibernates at low-battery cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health after installing a new cell on the NB6600

The NB6600 BIOS reads health data stored in the battery EEPROM, not from live cell measurements. When a new cell goes in, the EEPROM data doesn't match the BIOS's learned baseline from the old pack, so the system flags it as degraded. This isn't a fault with the replacement cell — it's a calibration mismatch. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS relearn the cell's actual capacity curve and clears the false health warning.

Laptop shuts down at 20–30% charge shown on the NB6600

This happens when the fuel gauge IC hasn't been calibrated against the new cell yet. The IC is still using the voltage-to-capacity curve from the old, degraded pack, so it misjudges the remaining charge and triggers a shutdown early. The fix is a calibration cycle: let the laptop discharge fully under normal load until it hibernates, then charge to 100% without interruption. After two or three of these cycles, the fuel gauge IC recalibrates and the reported percentage will align with actual cell voltage.